а. 1,6b-0.4=3.2-0.8 (2-b)

б. 2 (n-3) - 4 (5-2n) = - 5 - (4n+7)

в.-0,2 (6 х+1) / 3,6=0,5 х/9

а. 1,6b-0.4=3.2-0.8 (2-b)

1.6b-0.4=3.2-1.6+0.8b

1.6b-0.8b=3.2-1.6+0.4

0.8b=2

b=2.5

б. 2 (n-3) - 4 (5-2n) = - 5 - (4n+7)

2n-6-20+8n=-5-4n-7

2n+8n+4n=-5-7+6+20

14n=14

n=1

в.-0,2 (6 х+1) / 3,6=0,5 х/9

-6.2x-0.2/3.6=0.5 х/9

-31 х+1 = х

-32 х=-1

х=1/32

а. 1,6b-0,4=3,2-0,8 (2-b)

1,6b-0,4=3,2-1,6+0,8b

1,6b-0,8b=3,2-1,6+0,4

0,8b=2

b=2,5

б. 2 (n-3) - 4 (5-2n) = - 5 - (4n+7)

2n-6-20+8n=-5-4n-7

2n+8n+4n=-5-7+20+6

14n=14

n=1